I think we need more input before you find the laser-like intellectual firepower of ARFCOM brought down on this question. Is this your only pistol, and do you use it for self-defense or plinking for grins?
If it were a 9mm EMP, I'd keep it just because it would be cheap to shoot. Since it is a 40, I'd make that trade because I am much impressed by DW products (what little I have seen of them) and never cared for the .40 anyhow.
Do the DW deal. The more I think about it the better I like it.